不同变质程度煤吸附能力影响因素研究  

Study on influence factors of adsorption capacity of different metamorphic degree coals

作　　者：张凯[1,2] 汤达祯[1,2] 陶树[1,2] 刘彦飞[1,2] 陈世达[1,2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]煤层气开发利用国家工程中心煤储层实验室,北京100083

出　　处：《煤炭科学技术》2017年第5期192-197,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41272175);国家自然科学基金青年基金资助项目(41502157)

摘　　要：为研究不同变质程度煤吸附能力的主控因素,通过显微组分分析、压汞试验、液氮试验以及等温吸附试验,分析了不同煤阶煤吸附能力差异。结果表明,研究区中煤的镜质组反射率R_o=0.44%~3.20%,兰氏体积为9.11~30.24 m^3/t,且随煤阶的增高逐渐增大;孔隙度、BET比表面积、微孔体积随煤阶的增高呈现高-低-高的变化规律,在R_o=1.9%左右时达到最小值,其影响着煤储层的吸附空间,但并不能主导煤储层吸附能力的变化;孔隙形态方面,墨水瓶孔对储层吸附能力控制较强;显微组分方面,镜质组含量在中低煤变质阶段对煤储层吸附能力起一定控制作用,在高变质阶段,惰质组中丝质体对储层吸附能力的控制更强。In order to study the main controlling factors of coal adsorption capacity with different metamorphism,through microscopic com- ponent analysis,mercury intrusion test,liquid nitrogen adsorption experiment and methane isothermal adsorption experiments,the relation- ship between coal rank and adsorption capacity were discussed. The results showed that R,, was 0.44%-3.20% ,Langmuir volume was 9.11 - 30.24 m^3/t , and R,, value increased with the coal rank increasing in the study area; the porosity values,the BET specific surface area,the micropore volume of coal samples presented a trend of high-low-high variation along with the rising of coal rank, and attained the minimal value when Rn= 2.3% ,the pore structure affected the adsorption space of the coal reservoir,but it could not lead to the change of the ad-sorption capacity of the coal reservoir. The pore shape especially the ink bottle pore is stronger than others. The vitrinite content plays a certain role in the adsorption capacity of the coal reservoirs during the low coal metamorphic grade,in the high metamorphic grade , and the fusinite＇ s control is stronger.

关 键 词：变质程度 吸附能力 孔隙 煤储层 

分 类 号：P618.11[天文地球—矿床学]